Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party. An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. Multiple input validation flaws were found in the MIT Kerberos GSS-API library’s implementation of the SPNEGO mechanism. A remote attacker could use these flaws to crash any network service utilizing the MIT Kerberos GSS-API library to authenticate users or, possibly, leak portions of the service’s memory. Updated packages are available from updates.redhat.com.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: krb5 security update Advisory ID: RHSA-2009:0408-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-0408.html Issue date: 2009-04-07 CVE Names: CVE-2009-0844 CVE-2009-0845 CVE-2009-0846 ===================================================================== 1. Summary: Updated krb5 packages that fix various security issues are now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team. 2. Relevant releases/architectures: RHEL Desktop Workstation (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 3. Description: Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party, the Key Distribution Center (KDC). The Generic Security Service Application Program Interface (GSS-API) definition provides security services to callers (protocols) in a generic fashion. The Simple and Protected GSS-API Negotiation (SPNEGO) mechanism is used by GSS-API peers to choose from a common set of security mechanisms. An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. (CVE-2009-0846) Multiple input validation flaws were found in the MIT Kerberos GSS-API library's implementation of the SPNEGO mechanism. A remote attacker could use these flaws to crash any network service utilizing the MIT Kerberos GSS-API library to authenticate users or, possibly, leak portions of the service's memory. (CVE-2009-0844, CVE-2009-0845) All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. All running services using the MIT Kerberos libraries must be restarted for the update to take effect. 4. Solution: Before applying this update, make sure that all previously-released errata relevant to your system have been applied. This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 490634 - CVE-2009-0845 krb5: NULL pointer dereference in GSSAPI SPNEGO (MITKRB5-SA-2009-001) 491033 - CVE-2009-0844 krb5: buffer over-read in SPNEGO GSS-API mechanism (MITKRB5-SA-2009-001) 491036 - CVE-2009-0846 krb5: ASN.1 decoder can free uninitialized pointer when decoding an invalid encoding (MITKRB5-SA-2009-002) 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm i386: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-libs-1.6.1-31.el5_3.3.i386.rpm krb5-workstation-1.6.1-31.el5_3.3.i386.rpm x86_64: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm krb5-libs-1.6.1-31.el5_3.3.i386.rpm krb5-libs-1.6.1-31.el5_3.3.x86_64.rpm krb5-workstation-1.6.1-31.el5_3.3.x86_64.rpm RHEL Desktop Workstation (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm i386: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-devel-1.6.1-31.el5_3.3.i386.rpm krb5-server-1.6.1-31.el5_3.3.i386.rpm x86_64: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm krb5-devel-1.6.1-31.el5_3.3.i386.rpm krb5-devel-1.6.1-31.el5_3.3.x86_64.rpm krb5-server-1.6.1-31.el5_3.3.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm i386: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-devel-1.6.1-31.el5_3.3.i386.rpm krb5-libs-1.6.1-31.el5_3.3.i386.rpm krb5-server-1.6.1-31.el5_3.3.i386.rpm krb5-workstation-1.6.1-31.el5_3.3.i386.rpm ia64: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-debuginfo-1.6.1-31.el5_3.3.ia64.rpm krb5-devel-1.6.1-31.el5_3.3.ia64.rpm krb5-libs-1.6.1-31.el5_3.3.i386.rpm krb5-libs-1.6.1-31.el5_3.3.ia64.rpm krb5-server-1.6.1-31.el5_3.3.ia64.rpm krb5-workstation-1.6.1-31.el5_3.3.ia64.rpm ppc: krb5-debuginfo-1.6.1-31.el5_3.3.ppc.rpm krb5-debuginfo-1.6.1-31.el5_3.3.ppc64.rpm krb5-devel-1.6.1-31.el5_3.3.ppc.rpm krb5-devel-1.6.1-31.el5_3.3.ppc64.rpm krb5-libs-1.6.1-31.el5_3.3.ppc.rpm krb5-libs-1.6.1-31.el5_3.3.ppc64.rpm krb5-server-1.6.1-31.el5_3.3.ppc.rpm krb5-workstation-1.6.1-31.el5_3.3.ppc.rpm s390x: krb5-debuginfo-1.6.1-31.el5_3.3.s390.rpm krb5-debuginfo-1.6.1-31.el5_3.3.s390x.rpm krb5-devel-1.6.1-31.el5_3.3.s390.rpm krb5-devel-1.6.1-31.el5_3.3.s390x.rpm krb5-libs-1.6.1-31.el5_3.3.s390.rpm krb5-libs-1.6.1-31.el5_3.3.s390x.rpm krb5-server-1.6.1-31.el5_3.3.s390x.rpm krb5-workstation-1.6.1-31.el5_3.3.s390x.rpm x86_64: krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm krb5-devel-1.6.1-31.el5_3.3.i386.rpm krb5-devel-1.6.1-31.el5_3.3.x86_64.rpm krb5-libs-1.6.1-31.el5_3.3.i386.rpm krb5-libs-1.6.1-31.el5_3.3.x86_64.rpm krb5-server-1.6.1-31.el5_3.3.x86_64.rpm krb5-workstation-1.6.1-31.el5_3.3.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://www.redhat.com/security/team/key/#package 7. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0844 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0845 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0846 http://www.redhat.com/security/updates/classification/#important http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-002.txt 8. Contact: The Red Hat security contact is <firstname.lastname@example.org>. More contact details at https://www.redhat.com/security/team/contact/ Copyright 2009 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFJ26JGXlSAg2UNWIIRApmQAKCz/3j4ImhDahQrHVvNG0KzAZH2YwCgjbPL e8VvZn2yybWvy6YMSxmxApQ= =4z8P -----END PGP SIGNATURE-----